CRIME: Britain's First Female Serial Killer: Mary Ann Cotton

October 9, 2026

AI Summary

5 min read

On Saturday, July 6, 1872, a parish official named Thomas Riley knocked on the door of number 13 Front Street in West Auckland, northern England. He needed a nurse for a smallpox patient and asked a local widow known for keeping the cleanest house on the street. She turned him down, saying she had her seven-year-old stepson at home and nobody to leave him with. Then she asked whether the parish could take the boy off her hands. When Riley refused, she told him the boy was sickly and would die like the rest of his family had. She added that she "wouldn't be troubled long." Six days later, the boy, Charles Edward Cotton, was dead. A neighbor had seen him running errands the week before. A doctor examined the body, a coroner's jury ruled natural causes, and the woman walked away clean. Her name was Mary Ann Cotton, and between 1852 and 1872, she had lost three husbands, a lover, her own mother, and as many as eleven children and stepchildren—all to "gastric fever" or "typhoid." She collected the insurance payments each time. It took two decades for anyone to connect the dots.

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What you'll learn

1 (00:36) **Thomas Riley's Disturbing Encounter** - A parish official is told by a widow that her stepson will "die like the rest of his family," setting the stage for the investigation.
2 (02:44) **Introducing the "Blueprint"** - The podcast frames Mary Ann Cotton as Britain's first female serial killer, a figure more prolific but less famous than Jack the Ripper.
3 (06:36) **The Origin Story: A Father's Fall** - Mary Ann's childhood is defined by her father's death in a mining accident, which immediately throws her family into poverty.
4 (08:42) **First Marriage and the Pattern Begins** - Mary Ann marries William Mowbray, and they have several children, most of whom die young from "gastric fever."
5 (10:51) **A Widow's New Skills** - After collecting on her husband and two more children, Mary Ann moves and takes a job as a nurse, learning the signs of illness and death.
6 (14:03) **The Robinson Household** - Mary Ann answers an ad to care for widower James Robinson and his five children, becoming a housekeeper and then a wife, with deadly results.
7 (19:48) **The West Auckland Cluster** - After being thrown out by Robinson, Mary Ann moves in with a friend, Margaret Cotton, and soon marries her widowed brother, Frederick.

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Show Notes

Long before the name Jack the Ripper struck fear into Victorian England, a respectable-looking widow named Mary Ann Cotton was quietly killing her way through the north of the country. By the time investigators caught up with her in 1872, she had outlived four husbands, a lover, and eleven of her own children, nearly all of them poisoned with arsenic and many insured for cash. Hiding in plain sight behind the mask of a grieving mother and wife, she is now considered Britain's first known serial killer, and one of its most overlooked. In this episode of Conspiracy Theories, Cults, & Crimes, Vanessa Richardson uncovers the chilling story of Mary Ann Cotton, the string of deaths that followed her from town to town, and how a woman managed to murder on such a staggering scale for so long before anyone noticed.

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